Replacing part of string in angularjs with json values

Question

I am trying to replace string words which are enclosed in $ with values of JSON.

For example:

I have json.

$scope.data = {
  name: "Some Name",
  user: "User Name",
  designation: "Designation",
  fullName:"User Full Name"
}

And I have String:

$scope.str="User name of $user$ is $name$ and designation is  $designation$";

Is there any angular method from which I can directly replace variables from this string?

I tried using loop through keys and verifying, It is working but there are more than 100 keys in json and there might be less than 20 keys will get used in string.

I am expecting a better approach which improve performance.

dfsq · Accepted Answer · 2015-08-03 12:26:40Z

1). String.prototype.replace. It actually makes sense to do it in pure Javascript with String.prototype.replace method, it's going to be more effective. For example like this:

$scope = {};
$scope.data = {
    name: "Some Name",
    user: "User Name",
    designation: "Designation",
    fullName: "User Full Name"
};

$scope.str = "User name of $user$ is $name$ and designation is  $designation$";

$scope.str = $scope.str.replace(/\$(\w+)\$/g, function(a, b) {
    return typeof $scope.data[b] !== 'undefined' ? $scope.data[b] : ''; 
});

alert($scope.str);

If you plan to use this "micro-templater" more then once, consider to move it into separate service.

2). Angular $interpolate. You can also make use of interpolate service if you can change placeholder syntax to {{name}}:

app.controller('MainCtrl', function($scope, $interpolate) {

    $scope.data = {
        name: "Some Name",
        user: "User Name",
        designation: "Designation",
        fullName: "User Full Name"
    };

    $scope.str = "User name of {{user}} is {{name}} and designation is  {{designation}}";

    $scope.str = $interpolate($scope.str)($scope.data);
});

Once again, you can build simple template service on top of it:

app.service('template', function($interpolate) {
    return function(str, data) {
        return $interpolate(str)(data);
    };
});

and use it in controller like:

$scope.str = template($scope.str, $scope.data);

farincz · Accepted Answer · 2015-08-03 12:23:48Z

2

It's not pure angular but if you by change using Lodash (which is utility library taking part of many projects) there is template method. And you can easily configure a placeholder syntax

_.templateSettings.interpolate = /\$([\s\S]+?)\$/g;
var compiled = _.template('User name of $user$...');
compiled({ 'user': 'Foo' });

answered Aug 3, 2015 at 12:23

farincz

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